The acrylic polymer from which Figure was obtained is subjected to an alternating stress b...

The acrylic polymer from which Figure was obtained is subjected to an alternating stress between 15 MPa and 0 MPa. The largest surface cracks initially detected by nondestructive testing are 0.001 mm in length. If the critical fracture toughness of the polymer is 2 MPa , calculate the number of cycles required before failure occurs. Let f = 1.0. (Hint: Use the results of Problem 7-40.)